.header{
    height: 150px;
}
.a{
    float: right;
    margin-right: 20px;
    color: #696969;
    cursor: pointer;
}
.xiala{

}
.img{
    margin: 20px 50px 0 20%;
}
.index{
    background-color: red;
    height: 30px;
}